eth: bnxt: always recalculate features after XDP clearing, fix null-deref
In the Linux kernel, the following vulnerability has been resolved: eth: bnxt: always recalculate features after XDP clearing, fix null-deref Recalculate features when XDP is detached. Before: # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp # ip li set dev eth0 xdp off # ethtool -k eth0 | grep gro rx-gro-hw: off [requested on] After: # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp # ip li set dev eth0 xdp off # ethtool -k eth0 | grep gro rx-gro-hw: on The fact that HW-GRO doesn't get re-enabled automatically is just a minor annoyance. The real issue is that the features will randomly come back during another reconfiguration which just happens to invoke netdev_update_features(). The driver doesn't handle reconfiguring two things at a time very robustly. Starting with commit 98ba1d931f61 ("bnxt_en: Fix RSS logic in __bnxt_reserve_rings()") we only reconfigure the RSS hash table if the "effective" number of Rx rings has changed. If HW-GRO is enabled "effective" number of rings is 2x what user sees. So if we are in the bad state, with HW-GRO re-enablement "pending" after XDP off, and we lower the rings by / 2 - the HW-GRO rings doing 2x and the ethtool -L doing / 2 may cancel each other out, and the: if (old_rx_rings != bp->hw_resc.resv_rx_rings && condition in __bnxt_reserve_rings() will be false. The RSS map won't get updated, and we'll crash with: BUG: kernel NULL pointer dereference, address: 0000000000000168 RIP: 0010:__bnxt_hwrm_vnic_set_rss+0x13a/0x1a0 bnxt_hwrm_
CVE-2025-21682
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-21682
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
"lessThan": "076a694a42ae3f0466bc6e4126050eeb7b7d299a",
"versionType": "git"
},
{
"status": "affected",
"version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
"lessThan": "90336fc3d6f5e716ac39a9ddbbde453e23a5aa65",
"versionType": "git"
},
{
"status": "affected",
"version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
"lessThan": "08831a894d18abfaabb5bbde7c2069a7fb41dd93",
"versionType": "git"
},
{
"status": "affected",
"version": "1054aee82321483dceabbb9b9e5d6512e8fe684b",
"lessThan": "f0aa6a37a3dbb40b272df5fc6db93c114688adcd",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/broadcom/bnxt/bnxt.c",
"drivers/net/ethernet/broadcom/bnxt/bnxt.h",
"drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.11",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/broadcom/bnxt/bnxt.c",
"drivers/net/ethernet/broadcom/bnxt/bnxt.h",
"drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21682
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26905 · Revision 1
- Added to Heist Feed
- Publisher date